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J Agric Food Chem. 2019 Jul 3;67(26):7258-7265. doi: 10.1021/acs.jafc.9b01722. Epub 2019 Jun 25.

Photodegradation of Myrigalone A, an Allelochemical from Myrica gale: Photoproducts and Effect of Terpenes.

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CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand , Université Clermont Auvergne , F-63000 Clermont-Ferrand , France.
UMR CNRS 5805 EPOC - OASU, Equipe LPTC, IUT de Périgueux , Rue du Doyen Lajugie , 24000 Périgueux , France.
USR 3278 CRIOBE, PSL Research University, EPHE-UPVD-CNRS, Université de Perpignan Via Domitia, Laboratoire d'Excellence ≪ CORAIL ≫ , Bâtiment T, 58 avenue P. Alduy , 66860 Perpignan , France.
AkiNaO SAS , F-66860 Perpignan , France.
INRA, PIAF , Université Clermont Auvergne , F-63000 Clermont-Ferrand , France.


This study investigated the environmental fate of myrigalone A, a light absorbing natural herbicide found on leaves and fruits of Myrica gale. Myrigalone A was irradiated in water and as a dry solid deposit to simulate reactions on leaves, alone and in the presence of the terpenes generated by Myrica gale. The phototransformation was fast ( t1/2 = 35 min in water). Analyses by liquid chromatography coupled to high resolution orbitrap electrospray mass spectrometry (MS) and gas chromatography-MS revealed the formation of 11 photoproducts in water and solid and 9 in gaseous phase. Some were detected in the leaf glands and oil covering the fruits of Myrica gale, which suggested that photodegradation occurred in the field. Moreover, myrigalone A photoinduced the oxidation of terpenes that in turn protected it against photolysis. This highlights the need for additional research on the effect of terpenes on the photodegradation of pesticides on vegetation.


H-donor additives; biopesticide; fate; medium; photolysis

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